So.. idea of this suggestion is that the player would have a waterbottle or be in water and perform the combo. There would be a small ball of water particles that would shoot out from your hands and be absorbed into the other player's body and there'll be a swirl of water healing the player.
The combo will remain until the original player 1.) Lets go of shift or 2.) Gets damaged / killed

And the idea of this is so that "Water Battle Medics" Would not have to go into the fray to directly be harmed while healing the other person. The healer could hide while the particles would slowly heal the fighter.